GPT-5.2 Pro vs Grok 4.3
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Quick verdict: which should you choose?
Choose GPT-5.2 Pro if you need
- ✓Choose Grok 4.3 if you need strong complex multi-step reasoning with a 43.9 intelligence_index.
- ✓Choose Grok 4.3 if you need 1M context for document-level tasks at $2.5/1M output price.
- ✓Choose Grok 4.3 if you need 134.99 t/s output speed and integrated real-time tool access.
- ✓Choose Grok 4.3 if you need helpful direct responses without high computational cost.
Choose Grok 4.3 if you need
- ✓Choose GPT-5.2 Pro if you need seamless handling of image, text, and file modalities together.
- ✓Choose GPT-5.2 Pro if you need strong integration across multiple input types for extended tasks.
- ✓Choose GPT-5.2 Pro if you need suitability for extended multi-turn multimodal conversations.
- ✓Choose GPT-5.2 Pro if you need a very large context window optimized for detailed inputs.
Verdict
Grok 4.3 leads on measurable performance metrics with a known intelligence_index of 43.9, 134.99 t/s speed, $2.5/1M price, and 1M context, suiting complex reasoning and document tasks. GPT-5.2 Pro offers stronger multimodal integration across images, text, and files but lacks disclosed intelligence or speed data while costing $168/1M with only 400k context. Grok 4.3 wins on cost-efficiency and scale; GPT-5.2 Pro leads where seamless multi-input handling is prioritized.
GPT-5.2 Pro vs Grok 4.3: side by side
| Spec | GPT-5.2 Pro | Grok 4.3 | Winner |
|---|---|---|---|
| Intelligence | — | 43.9 | Tie |
| Output speed | — | 135 t/s | Tie |
| Output price | $168.00/1M | $2.50/1M | Grok 4.3 |
| Context | 400K | 1000K | Grok 4.3 |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | OpenAI | xAI | Tie |
Detailed analysis
Pricing
Winner: Grok 4.3Grok 4.3 costs $2.5 per 1M output tokens while GPT-5.2 Pro costs $168 per 1M. This makes Grok 4.3 dramatically more affordable for high-volume use. Both are proprietary but the price gap favors Grok 4.3 on cost efficiency.
Context Window
Winner: Grok 4.3Grok 4.3 provides 1M tokens versus GPT-5.2 Pro's 400k tokens. Grok's larger window supports document-level tasks while GPT-5.2 Pro notes potential reduced precision on very long inputs. Both list high computational demands at maximum context.
Multimodal Capabilities
Winner: GPT-5.2 ProGPT-5.2 Pro emphasizes seamless handling of images, text, and files with strong cross-modal integration. Grok 4.3 has vision capabilities described as less mature than specialized models. GPT-5.2 Pro is positioned for extended multi-turn multimodal tasks.
Speed & Intelligence
Winner: Grok 4.3Grok 4.3 reports 134.99 t/s output speed and an intelligence_index of 43.9. GPT-5.2 Pro provides no values for either metric. Grok 4.3 also highlights strong performance on complex reasoning tasks.
GPT-5.2 Pro
Pros
- +Very large context window for detailed inputs
- +Seamless handling of image, text, and file modalities
- +Strong integration across multiple input types
- +Suitable for extended multi-turn multimodal tasks
Cons
- –High computational demands for maximum context
- –Potential for reduced precision on very long inputs
- –Limited transparency on internal training data
Grok 4.3
Pros
- +Strong performance on complex multi-step reasoning
- +Large context window for document-level tasks
- +Helpful and direct response style
- +Integrated real-time tool access
Cons
- –Vision capabilities less mature than specialized models
- –Occasional over-refusal on edge-case queries
- –High computational cost for maximum context usage
Summary: GPT-5.2 Pro vs Grok 4.3
Select Grok 4.3 for cost, speed, context size, and reasoning performance where metrics are available. Choose GPT-5.2 Pro when seamless multi-modal file and image integration across turns matters most. The data favors Grok 4.3 on disclosed quantitative advantages.
Frequently asked questions
Grok 4.3 leads on price, speed, context, and known intelligence index; GPT-5.2 Pro leads on multimodal integration strength.